Refinance Mortgage Calculator
Estimate whether refinancing your home loan lowers your monthly payment, how long it takes to recover closing costs, and your total remaining loan cost.
How this refi calculator helps
Refinancing can be a smart move, but only if the numbers work in your favor. A lower rate does not automatically mean lower total cost. This refi calculator is designed to answer the practical questions homeowners care about most:
- Will my monthly mortgage payment go down?
- How long will it take to recover my closing costs?
- Will I pay less (or more) over the remaining life of my loan?
By comparing your current loan terms to a proposed new loan, you can make a decision grounded in math rather than marketing.
What the calculator is estimating
1) Current monthly principal-and-interest payment
This is based on your remaining balance, current rate, and remaining years. It represents what your payment would be if you keep your existing mortgage.
2) New monthly principal-and-interest payment
This is based on the proposed refinance rate and term. If you choose to finance closing costs, those costs are added to your new loan balance, which can increase your payment and total interest paid.
3) Monthly savings (or increase)
The calculator subtracts your new payment from your current payment. Positive means you save monthly cash flow. Negative means your payment rises.
4) Break-even period
If you pay closing costs out of pocket, your break-even period tells you how many months of monthly savings it takes to recover that upfront expense. If the break-even point is longer than you expect to keep the home, refinancing may not be worth it.
5) Net total remaining cost
The tool compares your projected total payments from this point forward under each option. This includes loan payments and any upfront closing costs paid out of pocket.
When refinancing often makes sense
- Lower rate, similar term: You reduce both payment and total interest.
- Strong monthly savings: Enough to recover costs quickly and improve cash flow.
- Long time horizon: You expect to stay in the home past break-even.
- Removing mortgage insurance: In some cases, refinancing can eliminate PMI and improve monthly cost.
When refinancing can hurt your finances
- Resetting to a long term: A new 30-year loan can lower payment but increase lifetime cost.
- High fees: Closing costs and points may outweigh the rate benefit.
- Short ownership timeline: Selling soon can prevent reaching break-even.
- Cash-out overuse: Pulling equity can increase debt and risk.
Simple strategy to evaluate your result
Step 1: Check monthly savings
If your payment drops meaningfully, refinancing may improve monthly flexibility.
Step 2: Check break-even
Compare break-even months to how long you plan to keep the mortgage. A shorter break-even is generally safer.
Step 3: Check total remaining cost
Payment reduction alone can be misleading. Always compare total dollars paid from today onward.
Step 4: Stress-test for uncertainty
Ask: What if I move in 3–5 years? What if income changes? The best refinance is resilient under realistic scenarios.
Common refinance mistakes to avoid
- Focusing only on interest rate and ignoring fees.
- Ignoring the impact of extending term length.
- Not comparing multiple lenders and fee structures.
- Skipping the Loan Estimate details (origination, points, title, prepaid items).
- Assuming every refinance must include cash-out.
Bottom line
A refinance is neither automatically good nor bad; it is a tradeoff. Use the calculator to compare your current path against a new loan path, then align the result with your timeline and risk tolerance. If the break-even is reasonable and total cost is lower (or your cash-flow benefit is worth the tradeoff), refinancing can be a smart financial move.